NAS relies on TCP/IP network to share files,but traditional TCP/IP protocol stack takes up too much CPU overhead,which slows down the data traffic greatly.The DAFS protocol is a new file-access protocol designed to ta...NAS relies on TCP/IP network to share files,but traditional TCP/IP protocol stack takes up too much CPU overhead,which slows down the data traffic greatly.The DAFS protocol is a new file-access protocol designed to take advantages of emerging RDMA and will dramatically enhance the performance of storage networking.DAFS is based on the virtual interface protocol,which can run over three different types of network,Ethernet plus IP,Infiniband and Fibre Channel.展开更多
为了提高物联网通信技术的可靠传输,研究利用中继协作进行传输的方法,针对变电站运行状态监测系统中无线传感网节点特性建立了两跳两中继的通信模型,分析了译码转发(DAF,Decode and Forward)和放大转发(AAF,Amplify and Forward)两种中...为了提高物联网通信技术的可靠传输,研究利用中继协作进行传输的方法,针对变电站运行状态监测系统中无线传感网节点特性建立了两跳两中继的通信模型,分析了译码转发(DAF,Decode and Forward)和放大转发(AAF,Amplify and Forward)两种中继转发协议的性能,并推导源节点到目标节点的误码率计算过程。为了进一步验证中继协议和调制方式对通信系统传输性能的影响,通过MATLAB编程对理论分析进行仿真,仿真结果表明,在变电站传感器节点通信中引入中继技术能有效提高监控系统可靠性,且在两跳多支路中继系统中,多支路同时转发时AAF方式误码率要低于DAF方式,从调制技术看,二进制相移键控(BPSK)的抗噪性能较优,在物联网无线网络通信中采用AAF中继转发协议且调制方式选取BPSK可以得到较低的误码率。展开更多
文摘NAS relies on TCP/IP network to share files,but traditional TCP/IP protocol stack takes up too much CPU overhead,which slows down the data traffic greatly.The DAFS protocol is a new file-access protocol designed to take advantages of emerging RDMA and will dramatically enhance the performance of storage networking.DAFS is based on the virtual interface protocol,which can run over three different types of network,Ethernet plus IP,Infiniband and Fibre Channel.
文摘为了提高物联网通信技术的可靠传输,研究利用中继协作进行传输的方法,针对变电站运行状态监测系统中无线传感网节点特性建立了两跳两中继的通信模型,分析了译码转发(DAF,Decode and Forward)和放大转发(AAF,Amplify and Forward)两种中继转发协议的性能,并推导源节点到目标节点的误码率计算过程。为了进一步验证中继协议和调制方式对通信系统传输性能的影响,通过MATLAB编程对理论分析进行仿真,仿真结果表明,在变电站传感器节点通信中引入中继技术能有效提高监控系统可靠性,且在两跳多支路中继系统中,多支路同时转发时AAF方式误码率要低于DAF方式,从调制技术看,二进制相移键控(BPSK)的抗噪性能较优,在物联网无线网络通信中采用AAF中继转发协议且调制方式选取BPSK可以得到较低的误码率。
